The new building of the Irina Viner Rhythmic Gymnastics Center in Luzhniki resembles a fluttering gymnastic ribbon, becoming a giant volumetric symbol of an elegant sport. The project, the most noticeable feature of which is the nonlinear form of a giant metal "sculpture", clearly distinguishable from everywhere, was developed by the architects of TPO "Pride".
In this article - in detail about how
How the unique image of the building was created and what constitutes a "graceful sweep of a gymnastic ribbon"
The most expressive element of the building, the roof, has become one of the most difficult for architectural design and implementation.
Initially, the architects and engineers of TPO "Pride" developed several options for roof-bearing structures: from wooden rafters to metal frames. The latter was chosen to satisfy both aesthetic and economic requirements. Further, according to the plan, the visual effect of the iridescent scales of the wave should have been formed by aluminum cassettes of decorative cladding, fixed on the already sealed roofing.
Therefore, in addition to the search for the geometry of the expressive silhouette of the wave, commensurate with the volume of the building and its surroundings, it was necessary to find the appropriate materials that would meet the assigned tasks: bent at the right angle and hermetically docked with each other. And also a manufacturer who could fulfill them. Another parameter was the repeatability, that is, the typification of various elements: trusses, cassettes, folds, since the variety of modules significantly affects the economics of the project.
For the implementation of the roofing system - the so-called "roofing pie" and sealed roofing, the Italian company ISCOM and its representative on the Russian market - Riverclack (Riverclack seam roofing system) were chosen.
Co-development of the project was carried out at the company's head office in Verona. Then it was finalized in accordance with the requirements of Russian standards in Moscow.
The company's specialists note that it was technically the most complex project built over the past few years using Riverclack technology
Why Riverclack®
Riverclalck's patented snap fastening system®550, thanks to the unique system of the lock with a drainage channel, will ensure the complete watertightness of the building and will withstand all the vagaries of the weather. The Riverclalck roof system is completely watertight, even when completely flooded with water.
Riverclack system® does not provide for any through holes on the roof surface, which gives the possibility of free thermal expansion of the elements. The panels can thus be more than 100 meters long.
Probably the highest flexibility properties of any metal coating system. Riverclack Panels® bend “naturally” following the lines of the underlying structure up to a minimum radius of 25 m (made of natural aluminum with a thickness of 0.7 millimeters), that is, without additional costs for mechanical bending of the panels.
AND ISCOM's international experience in co-design and implementation of other complex projects, allowed us to quickly get into work and find optimal solutions … ISCOM enlisted the cooperation of the Italian company Polytechnica, which specializes in integrated design, to develop the shaping support structure of the “roofing pie”.
Important Features of the Riverclack® Roofing System for Luzhniki CHG
Curvature: double radius
For most roofing materials, the surface curvature in this project has a critical radius … Each element has both convex and concave sections, and, moreover, it must adapt to the transverse radius of the second curvature. At the same time, the tolerances for the deviation of the real surface from the projected one are in the range from 20 to 50 mm.
As the main roof covering with a total area of 15.200 m² with a double radius of curvature were used Riverclack® 550 picture aluminum panels with a thickness of 0.8 mm in various shapes (straight, tapered, radius), which was the best solution for this project.
Rollforming, rolling and calendering: all right on site
Considering the great length of the picture panels, the stages of their profiling and rolling were carried out directly at the construction site.
For the production of the panels, a profiling machine was used, which ensured the production of both straight and silhouette panels. For 50% of the sites, the panel was machine-formed with a calendering machine. When calendering, the panel gets the exact radius of curvature given by the project.
Two kinds of clips - panel holders
Normal, with a highly slip surface - and a special clip " Morbidon", Which allows you to" stretch "the lock a little to slightly change the width of the straight panels and give them a silhouette profile.
Separately - about the design and manufacture of a complex metal frame of an undulating roof: a form-building structure and a roofing substructure
First of all, a 3D model of the layout of the Riverclack panels was created, which allowed us to check the feasibility of the project.
Then the specialists started designing the form-building structures. They consist of calendered, radially bent pipes, as well as a system of brackets, the angle of inclination of which was adjusted depending on the slope of the profiled sheet. The brackets were located in pairs, on opposite sides of the pipe - each side eventually smoothly adjusted to the angle of the profiled sheet with torsion twisting laid on top.
The upper belt of the main metal structures was not designed to carry a distributed load, therefore, the forming structures were hinged with a nodal support. The step of installing the formative structures is 4 meters. In this case, segmental sections were obtained, which did not allow to provide the given double curvature of the surface and the given tolerances, that is why a sophisticated roofing substructure was also developed.
In order to obtain the surface of the required radius of curvature, an additional complex bracket system was provided. Rows of reinforced L-brackets of different heights eliminate the difference in the distances from the battens to the roofing. The final adaptation is done directly by the Riverclack panel itself - it is quite flexible. The special alloy AW5754 allows the panel to bend without damaging the surface, which also allows free walking on the surface.
Forming brackets and roof substructures are produced without welding - only laser cutting, bending and bolting of elements are used here.
Riverclack specialists suggested one more elegant technical solution that made the project more economical … It's about the application cut omega-shaped profile, on the upper belt of which the load from the coating is transferred. As a result, the surface of the profiled sheet "works" completely, the load is evenly distributed over all waves.
According to the calculations of Riverclack engineers, even corrugated board with a profile height of 114 mm would be suitable for adequate load bearing, while the competitors' calculation showed that the minimum allowable profile height is 165 mm - only due to the fact that in their solution the load on the corrugated board was transferred pointwise.
Roof section 10+ falling down to the ground
The surface forming the southeastern façade of the building caused particular difficulty in installation. The roof-facade is additionally clad with decorative GRADAS cassettes a complex surface of double curvature is another design problem. The decorative elements are fixed over the Riverclack seam flooring on special Riverclack calipers … The panels are straight, but fastened at different angles, creating a “scale effect”. Panel joints are staggered. This is how the side and rear façades of the building are finished, and the cassettes themselves are made of natural anodized aluminum, designed and manufactured by GRADAS.
Roofing accessories - fixing without perforation
Lightning protection elements, snow retention system, bridges, antennas were fixed on the roof using Riverclack calipers, which allow you to fix any element without damage (perforation) of the coating. To ensure safe service, a rope “lifeline” was installed on the roof.
The company GRADAS for decorative cladding of the roofing - a huge visor - also made aluminum cassettes, the distinctive features of which are a triangular shape and an anodized gold finish. ***
Design: TPO PRIDE
Project development: METROPOLIS GROUP
General Contractor: Mosinzhproekt JSC
Contractor: DSF ENGINEERING
Investor: USMDEVELOPMENT Thank you
Roof portal, Andrey Solntsev;
Konstantin Kosarev, Development Director, Riverclack - Russia
for the materials provided. Video from the site
